registry config: add provider

src/routes/settings.js

@@ -194,6 +194,7 @@ function getRegistryConfig(req, res, next) {
 function setRegistryConfig(req, res, next) {
     assert.strictEqual(typeof req.body, 'object');
 
+    if (typeof req.body.provider !== 'string') return next(new HttpError(400, 'provider is required'));
     if (typeof req.body.serverAddress !== 'string') return next(new HttpError(400, 'serverAddress is required'));
     if ('username' in req.body && typeof req.body.username !== 'string') return next(new HttpError(400, 'username is required'));
     if ('email' in req.body && typeof req.body.email !== 'string') return next(new HttpError(400, 'email is required'));